From the manufacturer:
Helps maintain a healthy digestive tract**
Helps ease occasional stomach discomfort**
Superior Triple-shell protection
Natrol ® Probiotic Acidophilus BioBeads® are uniquely protected by an advanced triple shell that ensures viability through all three biophases:
Biophase 1: Targeted-release technology helps guarantee BioBeads potency on the shelf, and protects viable microflora all the way to ingestion.
Biophase 2: Bead passes safely through the acidic stomach environment unharmed.
Biophase 3: Inner layer gently breaks down, releasing proprietary blend of probiotics that help support digestive health and immunity.**